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3 years ago

How do you solve this? Number 3 please

Mathematics

1 answer:

max2010maxim [7]3 years ago

3 0

First, you have to find out what's 7% of $80. So what you do is multiply 80 by 0.07, which leaves you with $5.60. Add 5.6 to 80 so you get 85.6. Now you have to find how much the 20% of 80 is. So you multiply 80 by 0.2, leaving you with 16. So you subtract 16 from 85.6, leaving you with 69.6. So the total cost of the skateboard would be $69.60.

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To prepare a chocolate cake, 2 1/4 cups of flour were used. How many grams of flour was used if each cup of flour weighs 120 gra

Marianna [84]

120/4 = 30
120 x 2 = 240
240 + 30 = 270
270 grams of flour were used

4 0

3 years ago

Scores on an exam follow an approximately bell shaped distribution with a mean of 76.4 and a standard deviation of 6.1 points. A

Crazy boy [7]

Answer:

b) 95%

Step-by-step explanation:

We have been given that scores on an approximately bell shaped distribution with a mean of 76.4 and a standard deviation of 6.1 points. We are asked to find the percentage of the data that is between 64.2 points and 88.6 points.

First of all, we will find z-scores of each data point as:

$z=\frac{x-\mu}{\sigma}$

$z=\frac{64.2-76.4}{6.1}$

$z=\frac{-12.2}{6.1}$

$z=-2$

Let us find z-score corresponding to normal score 88.6.

$z=\frac{88.6-76.4}{6.1}$

$z=\frac{12.2}{6.1}$

$z=2$

To find the percentage of the data is between 64.2 points and 88.6 points, we need to find area under a normal distribution curve that lie within two standard deviation of mean.

The empirical rule of normal distribution states that approximately 95% of data points fall within two standard deviation of mean, therefore, option 'b' is the correct choice.

6 0

3 years ago

1. e(x) = 3 x -3, Find e(-6)

dlinn [17]

Answer:

e(-6) = -21

Step-by-step explanation:

Plug -6 into the equation and simplify.

3(-6) - 3

-18 - 3

-21

6 0

3 years ago

What Is the width of 12 1/2 and 103 1/8

jolli1 [7]

Answer=8.25 or 8 1/4

Area=103 1/8
Length=12 1/2

Okay, so we know the Area and Length of a rectangle, and are just trying to solve for the width.

The formula for the area of a rectangle is:
Area=length*width

Now lets fill in the data that we know

103 1/8=12 1/2 * width
to get the width by itself, divide both sides by 12 1/2
8.25=width

Answer=8.25 or 8 1/4

8 0

4 years ago

Read 2 more answers

Help will mark Brainliest

nevsk [136]

I think 4 3/4
Hope this helps

8 0

3 years ago